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Yes, 10 ml plus scoop of DPD, dropwise addition of FAS, multiply X 0.5. Having a chemistry education and career, I'm understandably curious about accuracy of test methods. So the statements of "worthless" or "take it to the bank" aren't as quantitative as I'd like. Nevertheless, I'll go with...

Testing for chlorine with the FAS/DPD test gives me results 2.5 times higher than the pool store, test strips, or color comparison liquid (OTO) tests. Bioguard analysis said 1.6% total chlorine, but the FAS/DPD showed 4.0%. Any help would be appreciated. Thanks